Final answer:
Roper Starch identifies the 10 percent of people with broad social influence as 'opinion leaders', (option B) who shape public opinion through their social networks and media influence.
Step-by-step explanation:
According to Roper Starch, the 10 percent of the population that have broad social networks which enable them to influence the attitudes and behaviors of the other 90 percent of the population are called opinion leaders. These individuals vary from politicians, journalists, to everyday people who are active within their social circle or on social media. They are instrumental in shaping public opinion through various means, including media consumption and distribution, informed dialogue, and by serving as role models or reference points for others' opinions.